末次冰盛期雅鲁藏布江下游冰川物质平衡线高度变化的空间差异性

作     者：李豪 刘双 胡凯衡 张晓鹏 LI Hao;LIU Shuang;HU Kaiheng;ZHANG Xiaopeng

作者机构：State Key Laboratory of Mountain Hazards and Engineering ResilienceInstitute of Mountain Hazards and EnvironmentCASChengdu 610299China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Geographical Sciences》 (地理学报（英文版）)

年 卷 期：2024年第34卷第6期

页      面：1157-1173页

核心收录：

学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：The Second Tibetan Plateau Scientific Expedition and Research Program (STEP),No.2019QZKK0902 Key Research and Development Program of Xizang Uygur Autonomous Region,No.XZ202301ZY0039G National Natural Science Foundation of China,No.42305178, No.91747207, No.41790434 

主　　题：glacier extension glacier equilibrium-line altitudes Yarlung Zangbo Downstream Basin southeastern Tibetan Plateau high-resolution paleoclimate simulations 

摘      要：Glaciers in the Yarlung Zangbo Downstream Basin(YZDB) are sensitive to global climate change. The equilibrium-line altitude(ELA) is a key indicator of glacial *** models for simulating the meteorological ELA underestimate the extent of glacial advance during the Last Glacial Maximum(LGM) in the YZDB and cannot explain the large-scale glacial extension compared with the Yarlung Zangbo Midstream Basin(YZMB). In this study, the distribution of ELA in the LGM is reconstructed using high-resolution 80-km ECHAM5 simulations and empirical relationships between temperature and *** in ELA between the LGM and pre-industrial era(PI) are compared. Our simulated ELA closely fits the published field data. In the YZDB, simulated LGM ELAs range from ca.3500 m to over 4900 m, representing declines of ca. 300–950 m. The ECHAM5 simulations better reflect the complex topographic features than most coarse-resolution climate models,and the ELA distribution is controlled by the spatial arrangement of river valley systems and mountain ranges and their impact on precipitation. Compared with the PI era, most of the monsoon precipitation in the LGM was concentrated in the YZDB, which is the main driver of glacial extension and the differential response of the downstream and midstream basins.